An automated, battery-powered device designed to continuously record electrocardiographic signals in ambulatory patients for periods greater than 24 hours, for the diagnosis of cardiac disorders (e.g., arrhythmias). Often called a Holter monitor, it includes a data recorder, surface electrodes that are worn on the chest of the patient, and may include accessories intended for attachment/removal (e.g., wipes, adhesive remover). The recorded data is analysed at a medical/diagnostic facility using an electrocardiographic analyser (e.g., Holter analyser) or a computer, with dedicated software. The recorder may also allow for manual recording of symptoms (e.g., palpitations, shortness of breath).